Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 85 μm

• Main Authors: Nedeljkovic, Milos, Penades, Jordi Soler, Mittal, Vinita, Murugan, Ganapathy Senthil, Khokhar, Ali Z., Littlejohns, Callum, Carpenter, Lewis G., Gawith, Corin B. E., Wilkinson, James S., Mashanovich, Goran Z.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering::Electrical and electronic engineering; Integrated Optics; Infrared
• Online Access: https://hdl.handle.net/10356/89763; http://hdl.handle.net/10220/46376
• Institution: Nanyang Technological University

We report transmission measurements of germanium on silicon waveguides in the 7.5–8.5 μm wavelength range, with a minimum propagation loss of 2.5 dB/cm at 7.575 μm. However, we find an unexpected strongly increasing loss at higher wavelengths, potential causes of which we discuss in detail. We also...